Dinitroindazol-dyestuffs for wool and a process of making same



Patented July 14, 1936 UNITED STATES 2,047,435 PATENT OFFICE DINITROINDAZOL-DYESTUFFS FOR, WOOL AND A PROCESS OF MAKING SAIVIE Emil Senn, Basel, Switzerland,

assignor to J. R.

Geigy S. A., Basel, Switzerland, a Swiss firm No Drawing. Original application July 22, 1931,

Serial No. 552,556. Divided and this application February Claims.

NO NO:

R wherein X represents a halogen, Y represents OR, and R represents hydrogen or an alkyl group, in presence of an inert solvent, with an aryl-hydrazine-carboxylic acid.

The new dyestuffs dye animal fibres shades which are well levelled and are distinguished by a remarkable fastness to light. The condensation may be conducted in presence of water or of an organic solvent such as methyl or ethyl alcohol, glacial acetic acid, benzene, toluene or the like. It may be conducted with or without the addition of an acid binding agent, such as sodium acetate, potassium acetate, magnesia, etc.

The following example illustrates the invention, the parts being by weight:-

'76 parts of phenylhydrazine-metacarboxylic acid, 123 parts of 3,5-dinitro-2-chlorobenzoic acid, 42 parts of anhydrous sodium acetate and400 parts of glacial acetic acid are heated to boiling for 6-8 hours whilst stirring. After the reaction mixture has cooled, the product is separated by filtration and dissolved in 2,000 parts of hot water with the addition of sodium carbonate. The dyestufi is precipitated in the form of fine, small, black needles by salting out the deep brown solution. The product dyes wool in an acid bath pure yellowishbrown shades. It has the following formula:

NO 00 OOH 14, 1934, Serial No. Germany July 28, 1930 3,5-dinitro-2-halogen-4-ethylbenzoic acid and so on; also their methylor ethylesters may be used.

What I claim is: 1. A process for the manufacture of brown dinitro-iindazol-dyestuffs for W001, consisting in condensing by heating benzene dinitrobodies of the following constitution o O-Y wherein X represents a halogen, Y represents OR,

and R represents a member of the group consisting of hydrogen, a methyl and ethyl, in presence of an inert solvent, with an arylhydrazine-carboxylic acid of the benzene series.

2. A process for the manufacture of brown dinitro-indazol-dyestuffs for W001, consisting in condensing by heating benzene dinitrobodies of the following constitution NO: NO:

wherein X represents a halogen, Y represents OR,

and R represents a member of the group consisting of hydrogen, methyl and ethyl, in presence of an inert solvent and with addition of an acid binding agent, with an arylhydrazine-carboxylic acid of the benzene series.

3. A process for the manufacture of brown dinitro-indazol-dyestuffs for W001, consisting in condensing by heating a phenyl-hydrazine-carboxylic acid in presence of an inert solvent with a 3,5-dinitro-2-halogen benzoic acid.

4. A process for the manufacture of brown dinitro-indazol-dyestuffs for W001, consisting in condensing by heating phenyl-hydrazine-meta carboxylic acid in presence of an inert solvent with a. 3,5-dinitro-2-halogen benzoic acid.

5. Condensation products from halogen-dinitro-bodies of the benzene series and aryl-hydrazine-carboxylic acids of the benzene series, which constitute dyestuffs having the general formula NH-N NO:- 00 OOOH and dyeing wool in an acid bath brown shades well levelled and remarkably fast to light.

EMIL SENN. 

